Uniconazole and Adaptability of Transplantations by Enhancing the Competition Tolerance in a High Sowing Density of Rapeseed Blanket Seedlings

Having nursery rapeseed (Brassica napus L.) seedlings at a high density in tray is an indispensable step to realizing mechanized transplanting for rapeseed. The reduction seedling quality caused by sowing one of the key factors affecting and yield. Uniconazole has been considered as potential plant growth regulator improve under diverse unfavorable circumstances. In two densities (400 800 seeds per tray), experiment was carried out between 2021 2022 investigate effects uniconazole seed-coating treatments on pre-transplant post-transplant characteristics. results demonstrate that treatment can effectively reduce high-density-induced dry matter leaf area, stem thinness, petiole overgrowth. Further evidence quality, enhance yield, lessen yield loss due high-density provided maturity. However, because uncontrolled during late stage tray, relative rate after transplant shock revealed lower doses have negative effect recovery. principal coordinate analysis partial correlation proved net assimilation were related improvement tolerance treatment. Consequently, 500–750 mg L−1 coating 100 g 5 mL recommended this study, considering risk emergence overdose